Zend_Loader's autoloader has been deprecated in the upcoming Zend Framework version 1.8 and so you now get [an "autoload is deprecated"] notice if you use it.

The fix is simple - just change your call from the static registerAutoload method on the Zend_Loader library to a getInstance call on the new Zend_Loader_Autoloader. You can find out more information about this new component here.